The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 31, 2006
Filed:
Sep. 11, 2000
Kazuhiko Yao, Wakayama, JP;
Kenji Ekawa, Wakayama, JP;
Yoichiro Isota, Wakayama, JP;
Toru Nakaguchi, Wakayama, JP;
Kazuhiko Yao, Wakayama, JP;
Kenji Ekawa, Wakayama, JP;
Yoichiro Isota, Wakayama, JP;
Toru Nakaguchi, Wakayama, JP;
Honshu Chemical Industry Co., Ltd., Tokyo, JP;
Abstract
A process for production of 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane which comprises reacting phenol with 3,3,5-trimethylcyclohexanone in the presence of an acid catalyst, separating the resulting phenol adduct crystals of 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane from the resulting reaction mixture, and removing the phenol from the phenol adduct crystals, wherein the phenol adduct crystals are dissolved in a crystallization solvent comprising an aromatic hydrocarbon solvent and water, crystallizing the crystals of 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane out of the crystallization solvent, and collecting the crystals by filtration at a temperature of 40–60° C.